So, rather than speculation, the only way to solve this is through dyno testing in both 87 and 93 octane modes, right? I haven't seen that one yet. If I've missed something, please let me know.

FWIW, I've been running 93 for a while now, and I'm averaging a little over 32 MPG in mostly around town driving. One place where I notice a difference is on uphill climbs, where the 93 clearly allows the engine to pull better.

I apologize if that had already been stated. I was reading through the owners manual for the oil capacity and came across that in my reading. Any who those who prefer to see physical evidence here's a pic out of the owners manual for your viewing pleasure!

You clearly do not understand the engine management of the 2012 Focus, therefore your generalizations about octane do not apply.

I don't understand why so many people have a hard time wrapping their heads around VVT.

Quote:

Originally Posted by 2012FocusSEL

I apologize if that had already been stated. I was reading through the owners manual for the oil capacity and came across that in my reading. Any who those who prefer to see physical evidence here's a pic out of the owners manual for your viewing pleasure!

You mean the part that states; "Premium fuel will provide improved performance"?

I'm staying out of this one. All I know is since I got my car 11,500 and 10.5 months ago I've only for the most part used E0 91 octane. If E0 isn't available I just use 87 - which is rare. If I have to use 87 I always notice a decrease in fuel economy and SOTP performance.

I apologize if that had already been stated. I was reading through the owners manual for the oil capacity and came across that in my reading. Any who those who prefer to see physical evidence here's a pic out of the owners manual for your viewing pleasure!

The way I read that verbage in the manual, is that it means in areas where regular is considered lower than 87 octane, to use fuels labeled premium for better performance (especially in high altitude areas).

Register Now

In order to be able to post messages on the Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:

Password

Please enter a password for your user account. Note that passwords are case-sensitive.

Password:

Confirm Password:

Email Address

Please enter a valid email address for yourself.

Email Address:

Log-in

User Name

Remember Me?

Password

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Focus Fanatics Ford Focus Forum offers many fun ways for you to engage with other Ford Focus Owners from across the world. Whether it be about the aftermarket performance modifications, technical how-to's, European tuned suspension or awesome fuel economy similar to the Audi S3, Ford Fusion and Acura TLX. You can find all Ford Focus and Focus ST related information here. Join our Ford Focus discussion forums and chat with local Focus enthusiasts in your area. Challenger Hellcat - Charger Hellcat